Sense Adjustable Switching Power Supply ReCapped finished

[sam_sam_sam]

I bought this switching supply power a few months ago but did not have time to do anything but now because of being in between jobs I now have time for projects that were waiting for me to have time to do them

What do think about this switching power supply pictures are below

One note theses pictures are after I had recap this power supply

The capacitors were actually not that bad ESR value wise expect for a couple of them low UF value under 100 for non brand name capacitors

One other note I moved the indicator LED light to the outside of the enclosure so I can see it better

One final note which is a little strange for switching power supply I have worked with the inrush current is higher to trip my electronic fuse controller the maximum current for this controller is 5 amps

The inrush current at startup is 4.75 amps with no load on the power supply

If anyone is interested in this switching power supply I will post a link where you can buy one

[stj]

the inrush shows that the primary caps have some capability!

[sam_sam_sam]

Thanks

[momaka]

Originally Posted by sam_sam_sam

What do think about this switching power supply pictures are below

Well, I don't want to sound like a negative nancy... but many of these cheaper Chinese PSUs have a lot of "unpolished" sides.

First, the PCB design looks pretty sloppy - hard to tell where the separation is between primary and secondary. Pretty sure this one won't pass UL tests either.

Next, I can't quite tell the capacity of the primary caps, but looks like 680 uF. If that's the case, I'd say the output will probably become very limited around 350 Watts... maybe 400 with some luck. The label claims 20 Amps max at 24V. That's 480 Watts of output power. I have my doubts this Chinese design will do it without popping. Even peaking that high for more than a few seconds may not be a good idea.

On the plus side, this looks like a Half-bridge design, but done with MOSFETs. I wonder what kind of efficiency this PSU will get and if there is any improvement over regular BJTs (there should be, I think.)

[redwire]

It looks fine, the variable voltage and current would be really useful.
They put the earth-ground trace between the pri and sec, so that helps the pcb spacings. It has minimal EMI filtering and the smallish output capacitors at 20A ripple? But derate it to less than 500W chinese watts... Usually at 500W power level I am seeing a soft-start (relay) instead of a big NTC because they get hot. But this has a cooling fan.
True test would be charging a car battery.

[sam_sam_sam]

Momaka and Redwire

You both have brought some testing that I going to do on this switching power supply maybe in the next couple of days

Thanks for your feedback

I have a power supply tester that I going to use on it and slowly increase the current load and see what it can handle and still keep the voltage that it is set to I do want to see what it can handle because I would like to use it as a battery charger for Lithium Ion Battery types and nicad type and maybe sla type so I do need to know just how much abuse it can take

If I can remember correctly but I think I have shorted the power supply leads together and all it does is shutdown but I am not sure if I have done it this power supply yet or not but I think if I have not done this yet I might have a light bulb in series and do this test to begin with

[sam_sam_sam]

Update to this switching power supply case

I was not a big fan about the open end where the main power supply input are so

( even with the plastic cover over the terminals )

[ the volt/amp meter module not in a very convenient place for where and how I would like to read the display]

I have taken a plastic enclosure and cut it to fit the front of power supply input and have the input outlet from an ATX power supply enclosure and a on/off switch moving the volt/amp meter to the plastic enclosure and also put banana jacks for the output voltage

One note I remove the terminal block that was on the switching power supply board

So it more user friendly for how I want to use it

When I finish the modification to this switching power supply project I will post some pictures of it

[sam_sam_sam]

Originally Posted by sam_sam_sam

Momaka and Redwire

You both have brought some testing that I going to do on this switching power supply maybe in the next couple of days

Thanks for your feedback

I have a power supply tester that I going to use on it and slowly increase the current load and see what it can handle and still keep the voltage that it is set to I do want to see what it can handle because I would like to use it as a battery charger for Lithium Ion Battery types and nicad type and maybe sla type so I do need to know just how much abuse it can take

If I can remember correctly but I think I have shorted the power supply leads together and all it does is shutdown but I am not sure if I have done it this power supply yet or not but I think if I have not done this yet I might have a light bulb in series and do this test to begin with

The testing will be done shortly in next few days stay tune for more results
Hopefully I will not see this this would not be a good thing